NAME
ata_scmd_need_defer - Check whether we need to defer scmd
SYNOPSIS
int ata_scmd_need_defer(struct ata_device * dev, int is_io);
ARGUMENTS
dev
ATA device to which the command is addressed
is_io
Is the command IO (and thus possibly NCQ)?
DESCRIPTION
NCQ and non-NCQ commands cannot run together. As upper layer only knows the queue depth, we are responsible for maintaining exclusion. This function checks whether a new command can be issued to dev.
LOCKING
spin_lock_irqsave(host_set lock)
RETURNS
1 if deferring is needed, 0 otherwise.
AUTHOR
Jeff Garzik
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Author.